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Reports duplicate branches in a RegExp alternation.
Duplicate branches slow down matching and obscure the intent of the expression.
<p><b>Example:</b></p>
<pre><code>
  (alpha|bravo|charlie|alpha)
</code></pre>
<p>After the quick-fix is applied:</p>
<pre><code>
  (alpha|bravo|charlie)
</code></pre>
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<p><small>New in 2017.1</small>
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